and in the construction and use of which the objects herein set out, as well as others, may

be attained, is illustrated in the accompanying drawings, in which v Figure 1 is a side view of my improved lock showing a chain secured thereto in a manner to look a tire, and with parts broken away to show construction.

Figure 2 is a new similar to Figure 1, but showing one end of the chain released, and parts broken away. i

V Figure 3 is an end view of the lock.

Figure 4 is a view similar to Figure 2, but showing the bolt in a position to release the opposite end of the chain from that as released in Figure 2. t

Figure 5 is a view looking at that'end of 39 the case opposite the end shown in Figure 3. V Figure 6 is a view in section on a plane denoted by the dotted line 66 ofFigure 2.

Figure 7 is a detail view partly in section and partly in elevation of the lock and discloses a form of connection between the lock barrel and the bolt.

Figure 8 is a detail plan view of the bolt with a portion of the aforementioned connection.

In the accompanying drawings the numeral 5 indicates the case of my improved lock that may be composed of any suitable material and that is solid as to the greater portion thereof. A hole is formed lengtht wise in the case within which hole. the barrel 6 of a pin tumbler lock is located and secured in any usual manner. This barrel is provided with pins to register with pins located in openings in the case 5 in a manner that {i will be readily understood by those skilled PATENT o-F E;

in the art, and a notchedkey 7 beingemployed:

to position the tumblers so that the barrelv maybe readily turned for thepurpose of operating the lock. All of'the parts thusv far described are of'old and-wellfknown co struction and further and detailed description is, therefore,.omitted herewith asnot being necessary for a thorough understand ing of the invention. d

Notches 8 are formed in one end of, the case 5, these notches being spaced apart to provide, a support 9 for a bolt 10, said support beinglocated between the notches" 8, and as clearly shown in Figures 1 to 3 of the drawings] The bolt is connected with the barrel 6 in such manner that rotation of the 'barrelwillfimpart a reciprocating movement to the bolt and the key being removable from the barrel only when the bolt is in its midposition, as shown in Figure 1. One manner of connecting the bolt to the barrel to eifect a reciprocating movement of the bolt has been shown in Figs. 7 and 8, but it isto be understood that any other well knownmeans maiy'be employed for this purpose.

'n Figs. 7 and8 the lock cylinder Gi s formed with a concentric extension 15 having an'eccentrically arranged pin 16. The lock bolt 10is provided with a transversely extending recess 17 arranged to receive an end portion of the pin 16. i v V I y c It will be noted that the locking position of the bolt isan intermediate position between its extremities of movement, that the tumblers will permit release and insertion of the key in this mid or looking position and that the bolt may be thrown in either direction from this mid-locking position to re lease or secure one end of a chain 11 only and in which positions the key cannot be removed from the barrel.

My improved lock, therefore, provides means whereby one end of the chain may be permanently attached to the look if desired,

this result being efiec'ted by the operation of the bolt, and by the same means the chain maybe detached from the bolt should occasion require such detachment.

When the key is in its mid-locking position, as above referred to, the tumblers of the sets 1213 will be in line with the outer surface of the barrel 6, as shown in Figure 1, the notches in the key placing the tumblers in this position from which the barrel may be turned by rotating the key. Vhen the barrel is turned to either of its unlocking positions, the ends of the tumblers of the set 13 in the barrel will rest against the wall of the barrel opening 14 in the case, and as shown in Figure 6 of the drawings. The opposite ends of said tumblers being in the notches of the key, the latter cannot be removed when the barrel is in this position and not until it is returned to its midposition, as hereinbefore referred to.

In accordance with the provisions of the patent statutes I have described the principles of operation of my invention, together with the device which I now consider to represent the best embodiment thereof; but I desire to have it understood that the device shown is only illustrative and that the invention may be carried out by other means and applied to uses other than those above set out.

I claim 1. A look including a case, a locking bolt movably mounted in the case, said case having a pair of notches with a support between said notches, said bolt being slidably mounted in said support with its opposite ends adapted to simultaneously secure a device in both of said notches and means for operating said bolt.

2. A lock including a casing having a pair of notches, a locking bolt slidable transversely with respect to the casing and said notches so as to occupy a portion of either or both of said notches, said bolt being of a length to extend across one or the other of said notches when in dilferent positions, and means for moving said bolt.

3. A lock including a casing having a pair of parallel notches entering the same from one end thereof, bolt receiving openings provided in the casing portions formed by said notches, a sliding bolt mounted in the casing and movable in said openings so as to pro-- ject through either or both of said notches, and means carried by the casing for operating said bolt.